237module13 - are 0.074 nm apart and the two electrons...

Quantum Mechanics I - Module 13 Some Discussion Questions 1. What type of bond would you expect for (a) the N 2 molecule (b) the HCl molecule (c) Fe atoms in a solid 2. If conduction electrons are free to roam about in a metal, why don’t they leave the metal entirely? 3. Explain why the resistivity of metals increases with temperature whereas the resistivity of semiconductors may decrease with increasing tempera-ture. 4. Describe how a pnp transistor can operate as an ampliﬁer. Binding Energy Estimate the binding energy of the H 2 molecule, assuming the two H nuclei

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Unformatted text preview: are 0.074 nm apart and the two electrons spend 33 percent of their time midway between them. Electron States There are 2 N possible electron states in the 3s band of Na, where N is the total number of atoms. 1. How many possible electron states are there in the 2s band? 2. How many possible electron states are there in the 2p band? 3. How many possible electron states are there in the 3p band? 4. State a general formula for the total number of possible states in any given electron band. 1...
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